linked-list-3.js

iterate() {
  let node = this.head
  while (node) {
    console.log(node.data)
    node = node.next
  }
}

search(data) {
  let idx = 0
  let node = this.head
  while (node) {
    if (node.data === data) return idx
    node = node.next
    idx += 1
  }
  return -1
}